9151381 has 2 divisors, whose sum is σ = 9151382. Its totient is φ = 9151380.

The previous prime is 9151357. The next prime is 9151391. The reversal of 9151381 is 1831519.

9151381 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7650756 + 1500625 = 2766^2 + 1225^2 .

It is a cyclic number.

It is not a de Polignac number, because 9151381 - 2⁵ = 9151349 is a prime.

It is a super-2 number, since 2×9151381² = 167495548414322, which contains 22 as substring.

It is equal to p₆₁₁₈₇₅ and since 9151381 and 611875 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9151301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4575690 + 4575691.

It is an arithmetic number, because the mean of its divisors is an integer number (4575691).

Almost surely, 2^9151381 is an apocalyptic number.

It is an amenable number.

9151381 is a deficient number, since it is larger than the sum of its proper divisors (1).

9151381 is an equidigital number, since it uses as much as digits as its factorization.

9151381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 28.

The square root of 9151381 is about 3025.1249560969. The cubic root of 9151381 is about 209.1681453276.

The spelling of 9151381 in words is "nine million, one hundred fifty-one thousand, three hundred eighty-one".